<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
    .father {
        overflow: hidden;
        width: 300px;
        height: 300px;
        margin: 100px auto;
        background-color: pink;
        text-align: center;
    }
    
    .son {
        width: 200px;
        height: 200px;
        margin: 50px;
        background-color: purple;
        line-height: 200px;
        color: #fff;
    }
    </style>
</head>
<body>
    <div class="father">
        <div class="son">son儿子</div>
    </div>
    <script>
        // 常见事件对象的属性和方法
        // 阻止事件冒泡 dom 推荐的标准 stopPropagation()
        var father = document.querySelector('.father');
        father.addEventListener('click', function(e) {
            alert('father');
            // e.stopPropagation();
            // e.cancelBubble = true;
        },false)
        var son = document.querySelector('.son');
        son.addEventListener('click', function(e) {
            alert('son');
            e.stopPropagation();
            e.cancelBubble = true; // 非标准cancel 取消bubble泡泡
        },false)
    </script>
</body>
</html>